Compiler warnings when building with GCC

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#342 opened on Sep 1, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 68/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Active
Tech stack: cpp
Domain: compilers

Research direction

Reproduce the warnings with GCC 16 on Linux or mingw-w64 using -Wall -Wextra -Wpedantic. Inspect the reported anonymous structs in DirectXMath/Inc/DirectXMath.h and the unused variables in DirectXMath/Inc/DirectXMathMatrix.inl around line 1165. Done means the reported warnings are addressed while the library still builds successfully.

Written by the indexing model from the issue text.

Description

Building with GCC 16 on Linux or mingw-w64 using -Wall -Wextra -Wpedantic flags generates the following compiler warnings:

In file included from main.cpp:3:
DirectXMath/Inc/DirectXMath.h:845:13: warning: ISO C++ prohibits anonymous structs [-Wpedantic]
  845 |             {
      |             ^
DirectXMath/Inc/DirectXMath.h:903:13: warning: ISO C++ prohibits anonymous structs [-Wpedantic]
  903 |             {
      |             ^
DirectXMath/Inc/DirectXMath.h:975:13: warning: ISO C++ prohibits anonymous structs [-Wpedantic]
  975 |             {
      |             ^
DirectXMath/Inc/DirectXMath.h:1043:13: warning: ISO C++ prohibits anonymous structs [-Wpedantic]
 1043 |             {
      |             ^
In file included from DirectXMath/Inc/DirectXMath.h:2372:
DirectXMath/Inc/DirectXMathMatrix.inl: In function ‘bool DirectX::XMMatrixDecompose(XMVECTOR*, XMVECTOR*, XMVECTOR*, FXMMATRIX)’:
DirectXMath/Inc/DirectXMathMatrix.inl:1165:16: warning: variable ‘aa’ set but not used [-Wunused-but-set-variable=]
 1165 |         size_t aa, bb, cc;
      |                ^~
DirectXMath/Inc/DirectXMathMatrix.inl:1165:20: warning: variable ‘bb’ set but not used [-Wunused-but-set-variable=]
 1165 |         size_t aa, bb, cc;
      |                    ^~

Clang doesn't seem to report any of these.

Dominant language: C++
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